test/hotspot/jtreg/runtime/ClassInitErrors/InitExceptionUnloadTest.java

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/**
 * @test
 * @bug 8048190
 * @summary Test that the NCDFE saves the stack trace for the original exception
 *          during class initialization with ExceptionInInitializationError,
 *          and doesn't prevent the classes in the stacktrace to be unloaded.
 * @requires vm.opt.final.ClassUnloading
 * @modules java.base/jdk.internal.misc
 * @library /test/lib
 * @build jdk.test.whitebox.WhiteBox
 * @run driver jdk.test.lib.helpers.ClassFileInstaller jdk.test.whitebox.WhiteBox
 * @run main/othervm -Xbootclasspath/a:. -Xmn8m -XX:+UnlockDiagnosticVMOptions -Xlog:class+unload -XX:+WhiteBoxAPI InitExceptionUnloadTest
 */

import java.io.ByteArrayOutputStream;
import java.io.PrintStream;
import java.util.Set;
import java.util.List;

import jdk.test.whitebox.WhiteBox;
import jdk.test.lib.classloader.ClassUnloadCommon;

public class InitExceptionUnloadTest {
    static public class ThrowsRuntimeException { static int x = 1/0; }
    static public class ThrowsError { static { if (true) throw new Error(); } }
    static public class SpecialException extends RuntimeException {
        SpecialException(int count, String message) {
            super(message + count);
        }
    }
    static public class ThrowsSpecialException {
        static {
            if (true) throw new SpecialException(3, "Very Special ");
        }
    }

    static public class ThrowsOOM {
        static {
            if (true) {
                // Actually getting an OOM might be fragile but it was tested.
                throw new OutOfMemoryError("Java heap space");
            }
        }
    }

    private static void verify_stack(Throwable e, String expected, String cause) throws Exception {
        ByteArrayOutputStream byteOS = new ByteArrayOutputStream();
        PrintStream printStream = new PrintStream(byteOS);
        e.printStackTrace(printStream);
        printStream.close();
        String stackTrace = byteOS.toString("ASCII");
        if (!stackTrace.contains(expected) || (cause != null && !stackTrace.contains(cause))) {
            throw new RuntimeException(expected + " and " + cause + " missing from stacktrace");
        }
    }

    static String[] expected = new String[] {
        "java.lang.ExceptionInInitializerError",
        "Caused by: java.lang.ArithmeticException: / by zero",
        "java.lang.NoClassDefFoundError: Could not initialize class InitExceptionUnloadTest$ThrowsRuntimeException",
        "Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.ArithmeticException: / by zero [in thread",
        "java.lang.Error",
        null,
        "java.lang.NoClassDefFoundError: Could not initialize class InitExceptionUnloadTest$ThrowsError",
        "Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.Error [in thread",
        "java.lang.ExceptionInInitializerError",
        "Caused by: InitExceptionUnloadTest$SpecialException: Very Special 3",
        "java.lang.NoClassDefFoundError: Could not initialize class InitExceptionUnloadTest$ThrowsSpecialException",
        "Caused by: java.lang.ExceptionInInitializerError: Exception InitExceptionUnloadTest$SpecialException: Very Special 3",
        "java.lang.OutOfMemoryError",
        "Java heap space",
        "java.lang.NoClassDefFoundError: Could not initialize class InitExceptionUnloadTest$ThrowsOOM",
        "Caused by: java.lang.ExceptionInInitializerError: Exception java.lang.OutOfMemoryError: Java heap space [in thread"
    };

    static String[] classNames = new String[] {
        "InitExceptionUnloadTest$ThrowsRuntimeException",
        "InitExceptionUnloadTest$ThrowsError",
        "InitExceptionUnloadTest$ThrowsSpecialException",
        "InitExceptionUnloadTest$ThrowsOOM" };

    public static WhiteBox wb = WhiteBox.getWhiteBox();

    static void test() throws Throwable {
        ClassLoader cl = ClassUnloadCommon.newClassLoader();
        int i = 0;
        for (String className : classNames) {
            for (int tries = 2; tries-- > 0; ) {
                System.err.println("--- try to load " + className);
                try {
                    Class<?> c = cl.loadClass(className);
                    Object inst = c.newInstance();
                } catch (Throwable t) {
                    t.printStackTrace();
                    System.err.println();
                    System.err.println("Check results");
                    verify_stack(t, expected[i], expected[i+1]);
                    i += 2;
                    System.err.println();
                }
            }
        }
        cl = null;

        Set<String> aliveClasses = ClassUnloadCommon.triggerUnloading(List.of(classNames));
        ClassUnloadCommon.failIf(!aliveClasses.isEmpty(), "should be unloaded: " + aliveClasses);
    }
    public static void main(java.lang.String[] unused) throws Throwable {
        test();
        test();
    }
}